cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A286974 Number of n X 3 0..1 arrays with the number of 1's horizontally or vertically adjacent to some 0 two less than the number of 0's adjacent to some 1.

Table of values

n a(n)
1 0
2 5
3 50
4 538
5 3932
6 32253
7 238532
8 1875212
9 14222474
10 110768815
11 851356180
12 6619388000
13 51243150110
14 398853561051
15 3101596551513
16 24188042117410
17 188685917890136
18 1474444397004861
19 11529364760294089
20 90260751863587788

List of values

[0, 5, 50, 538, 3932, 32253, 238532, 1875212, 14222474, 110768815, 851356180, 6619388000, 51243150110, 398853561051, 3101596551513, 24188042117410, 188685917890136, 1474444397004861, 11529364760294089, 90260751863587788]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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